Arc-welding system



A. M. BENNETT. ARC WELDING SYSTEM. APPLICATION FILED MAR. 29, 1918.

1,857,486, Patented. N03. 2, 1920.

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ALAN M. BENNETT, OF 'WESTFIELD, NEW JERSEY, ASE'IGNOB, BY MESNE ASEIGN-MENTS, TO BURKE ELECTRIC COT IPANY.

Specification of Letters Patent.

carom.

Patented Nov. 2, 1923512.

Application fil ed March 29,1918. Serial llc. 5255,4125,

Be it known that l, ALAN M. llnxmz'rr, a citizen of the llnited States.residing at llesttield, county of l nion, and State of New Jersey, haveinvented new and useful Improvements in i'trc-ll 'elding Systems, ofwhich the following is a specification.

Thi invention relates to means for weld inggr, llrazing or repairingmetals hy means of the electric arc.

The main object of the invention is to proride simplified means forcontrolling the current in an arc welding system. It contemplates theemployment and control of a resistance in the working circuit such thatthe current in. the Welding circuit will he desirably cont-rolled butwithout the inefticiency which has previously characterized wherein theworking; currei'its were reused to traverse resistances.

(lther and ancillary objects of the inven" tion will appear hereinafter.

The accompanying drawing, which illustrates the invention, is a diagramsetting forth an electric arc ri'elditu system em hodying the invention.v

Referring to the drawings, the apparatus comprises a direct currentgenerator .including an armature 1 a ssegmrately excited field :2, whichmay receive its energy from any suitable source of direct current, and lrics held 3 of which the inagzneioinotire force op mscs that of thefield 2.

The Work circuit may be traced from one side of the armature l. throughthe series held 3, conductor l, resistance 5 and con-- ductor l to thework 7 which forms one electrode oi the arc. Thence thc cirruit pas esacross the are to the Inovahle i-rlectrode 5%, through the conductor 3,the coil of the relay l and the condturtor 1 to the other terminal ofthe armature.

llhen the relayll) is energized its contacts clone a circuit through thecoil otthe relay 12 between the conductors i and 9: that is, across theterminals of the are so that the coil of the relay 1? is energizedproportionately to the voltage across the arc. Since the coil of therelay it) is in series in the work circuit the coil of relay 12 willhave its circuit closed only when current is flowing in the ivorkcircuit.

A short circu ting sln'int for the resistance 5, comprising theconductors l3 and. let,

adapted to he closed by the contacts of the relay l2 n'hen'the relay isenergized.

When the apparatus is not working the parts will he in the positionsindicated on the drawing. The voltage of the generator will he that dueto the field 2. There being no current in the \\'{)Il{ circuit theseries field will not he energized and there will he no drop ofpotential from the generator to the arc electrodes. it now the movableelectrode he struck against the work to initiate the arc current willflow in the Work circuit. llxcessire rush of current however will beprevented by the series field 3 which cuts down the gem-:rator voltage,and the resistance The relay ,10 being energized by the current in thework circuit, its contacts will closed, closing the circuit of the coilof the relay across the electrodes. When the electrode 8 has beenremoved from the work and the are drawn, drop of potential. across itwill energize the relay l2causing: its contacts to close and shortcircuiting the atulmtantinlly the voltage of the generator the generatorbeing so constructed and arranged that the excitation of the lield 2opposed by that of the series tield with normal working current willproduce the defl arc roitag e while variations in are will ati'ect thegenerator voltage so that the variation will he :zuihstantially neustralized and the current maintained suh- ,ztantia ll constant.

While ti invention has been illustrated in what considered its bestapplication, it may have other einhodin'ionts without departingfrom itsspirit and is not therefore, limited to the structure shown in thedrawing.

., What 1 claim is 1; In a system for welding, repairing and otherwisetreating metals h the electric arc,,the comhination with a generator,havingan exciting: field and a series field opp osed thereto, torimpressing voltage on the circuit, of electrodes a resistance, conductors eonnectn said electrodes, generator and resistance in circuit andmeans'for reresistance 5. The are will then operate" all till

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thereto, for impressing voltage on tho cii cult, of electrodes, arcsistancc, conductors connecting said electrodes, generator and sosistaiicc in circuit and means controlled by 5 the on: voltage foriinoving said i'esistancc from said circuit.

3. In a system for welding, i'cpaii'i, and otherwise treating metals bythe electric arc, the combination with a generator, having s an excitingfield. and a sei-ics field, opposed thereto, for iinpicssin; voltage on.the circuit, 01f elccti'odcs, a resistance, co'iiductoi's connectingsaid electrodes, gcscrator and 1- sistancc in circuit and inc-ailscouti'ollml by 5 the Working current for removiiig said 1's sistanccfrom said. circuit,

1. inv a system or Weld repairing andv otherwise .jting iictals oy theclcctric arc, the combination with a generator, haviupexciting licld anda s licld opp thereto, for impiessiug manage on tho c1 cuit, ofelectrodes, resistance, C(JllLllHJnTOlI'S connecting said olcccx'odcs,gcucsatoi: a: so

sistance in ciccuit and coatrolia the arc Yoltagc and Work "'17 curcentfor rcinoi ing said resistance fir. said circuit.

lo a system for Welding, rcpairing and UtllQYWlSQ trcatii'ig' metals bythe clc trio arc, the combination with a gcncratoi for im 3 pressingvoltage on the circuit, of electrodes, :1 rcsistancc, conductorscoiiuccting said electrodes gcueratoi" and ifcsistauce in aircuit andmeans opcratcd on failurc ot' ac: voltage on ahortcit-cuit andcontrollcd by tho working; (airrcnt to? 9 moving said icsistance onlyl'roxi'i'said ciicuit.

6. in a systcm for welding, repairing and othciwisc treating n'lctarlsby tho electric arc, the combination with a gcnci'ator l'oi' imaopressing; voltage on the circuit, of cloctiodcs,

a rcsistancc. conductors conn in: said zlc-cti'odcs, gcncrator androsistancc in circuit and moans operated upon failure of thc arc voltageon short circuit and controllcd by the working current for cstahlishiru:a shunt coimcction from ouc terminal of said rcsistancc to the other.

7. lo a systmu for \vcldiu r, repairing-and otlici'wi: fronting mctalshy the clcctric :ii'c,

the combination with a nciatoi", ll:1\lll f2lll exciting! field and a.scrics licld opposml thcrcto. for impressing.voltagc on tho (ircuit, ofelectrodes, a :csistazicc. condu tors commuting said clccti'odcm goutauto? and sosistance in circuit, a shunt for said i'csistaucc and arelay comprisingcouiacts in said shout and l'iaviug its coil conncctcdacross the arc,

8. in a system for: Welding. repairing and c0 UEl'LQYW SQ treating;metals b the clcctiiic am, the combination with a goiiei'atca',llilvli'lfl an exciting field. and a series field opposed thereto, forimpressing voltage on the Cli-' cult, of electrodes, a resistance,conductors connecting said electrodes, generator and 112- as sistance incircuit, a shoot for said resistance, a relay comprising contacts insaid shunt and having its coil connected across the arc, and a relayhaving its coil. in the WO'i'lC circuit and contacts in the circuit of7c the coil of t e aforcsaid relay.

9. iii a systci'n for Welding, repairing and otherwise treating metalsby the electric arc, tho combination with a generator, for impressingvoltage on the circuit, of electrodes, a icsistancc, conductorsconnecting said elccti'jodcs gcucratoi' and resistance in cii'cuit, ashunt for said resistance couuectcd at its do to tho terminals of saidresistance, a lay comprising contacts in said shunt and having coilconnected across the arc, and a relay having: its coil in the Workcircuit and contacts in the circuit of the coil of the a for-cs1: id relavg:

10. lo as cm for Welding, repairing and otherwise treating mot. ls bythe electric arc, the combination with a generator for inipfcssiugvoltagc on the circuit, of electrodes,

:1 i-csistaucc, conductors connecting" said electrodes, generator andresistance in circuit, means for removing said resistance from thecircuit comprising: a relay (energized according to the arc voltage anda relay controlling lip tho cli'coit olthc aforcsaid relay.

ii. u a Sfs'SllWi'l welding. repairing and e ticatiugr metals by theelectric arc, the combination with a generator for impressing voltage onthe circuit. oi clcctrodcs, a resistance. comluctors conne ting saidelectnalcs. gcuci'al'oi? and resistance in circuit, means for removing:said resistance from the circuit comprising a. relay energized accordingto the arc voltage and a'i'clay controllod according to thc workingcircuit con trolling i'lic circuit oi the aforesaid relay. 1

W. in a systcn'i for Weld ng, repairing. and olhciwisc ti'cal'ingi'motals li tlic electric arc, I tho coinliiualiimi with a generator forimpress ng voltage on the circuit, of electrodes :1 to istancc,conductors connecting said 10 clcctrmlcs, gmici-ator and rcsistanco incircuit. a normally opcucd shunt for said rcsistancc, a. normally opcncdrelay having its contacts in said shunt and adapted to be connectedacross tho arc and a second nor- 1155* mall opcucd relay having itsnormally opcncd contacts in the circuit of the coil of flu: afnrcsaidcclay and having its coil connected in sei'ics in the Work circuit.

"in tcstimouy whereof I have signed this 1 0 spcciflcation this 16th dayof ll'la ch, 1918.

.tliAlFl M. BENNETT.

